<form action="https://www.2checkout.com/2co/buyer/purchase" method="post">
<input type="hidden" name="sid" value="[merchant_id]">
<input type="hidden" name="quantity" value="1">
<input type="hidden" name="description" value="[item_name]">
<input type="hidden" name="product_id" value="[item_number]">
<input type="hidden" name="fixed" value="Y">
<input type="hidden" name="user_id" value="[user_id]">
<input type="image" src="[merchant_button]" border="0" name="submit" type="submit" alt="Buy from 2CO">
</form>